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CVE-2026-46840 is a critical authentication bypass vulnerability in Oracle REST Data Services (ORDS), specifically within its Backend‑as‑a‑Service (BaaS) component. Affected versions are 24.2.0 through 26.1.0. The flaw allows an unauthenticated attacker with network access via HTTPS to completely compromise ORDS without any user interaction or credentials. Because the vulnerability resides in a component that brokers API access to backend databases and connected systems, a successful exploit leads to a scope change – meaning additional products and data sources exposed through ORDS can also be taken over. The CVSS 3.1 base score is a perfect 10.0 (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H), indicating maximum impact on confidentiality, integrity, and availability across the entire affected environment. Attacks are easy to execute and require only a crafted HTTPS request to the BaaS endpoint. Once exploited, an attacker can bypass all authentication checks and gain administrative control over ORDS, effectively becoming the “owner” of the data service gateway. From there, they can read, modify, or delete any data exposed via the affected ORDS instance, and pivot to connected backend systems. Oracle has confirmed that the vulnerability is remotely exploitable without authentication and that the attack complexity is low. The only mitigating factor is that the target ORDS must have the BaaS component enabled (which is typical for many deployments). As of early June 2026, no public proof‑of‑concept code has been released, but given the CVSS score, active scanning and exploitation attempts are expected shortly after disclosure. Oracle addressed the flaw in its May 2026 Critical Security Patch Update, and all users are strongly advised to patch immediately.
DailyCVE Form:
Platform: Oracle REST Data Services
Version: 24.2.0‑26.1.0
Vulnerability: BaaS Auth Bypass
Severity: Critical (10.0)
date: 2026‑06‑04
Prediction: 2026‑06‑17
What Undercode Say:
Check ORDS version from the command line (if installed) java -jar ords.war version Manual detection – check for vulnerable endpoints curl -k -X GET "https://<target>/ords/<em>/baas/" -i Simple fingerprint test for the BaaS component curl -s -D - "https://<target>/ords/</em>/baas/manifest" -o /dev/null | grep -i "server"
Exploit:
The attack is performed over HTTPS by sending a specially crafted request to the BaaS API endpoint. Because the vulnerability is an authentication bypass, no credentials are required. The attacker can directly invoke privileged BaaS operations, such as creating new API keys, modifying data sources, or executing arbitrary database queries through ORDS. Once inside, the attacker can escalate to full takeover of ORDS and any connected systems due to the scope change.
Protection:
- Apply the Oracle Critical Security Patch Update (CSPU) for May 2026 immediately.
- If patching is not possible, disable the Backend‑as‑a‑Service component in ORDS configuration.
- Restrict HTTPS access to ORDS using network ACLs or WAF rules to allow only trusted IP addresses.
- Monitor logs for unexpected requests to `/ords/_/baas/` endpoints.
Impact:
Complete compromise of Oracle REST Data Services, leading to unauthorised read/write/delete access to all data exposed through ORDS. Because the attack changes the security scope, connected backend products and systems can also be taken over, potentially leading to a full breach of the entire data ecosystem.
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Sources:
Reported By: nvd.nist.gov
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